256-bit Secret Key Generator
Instantly generate strong, cryptographically secure random keys for your applications.
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Click "Generate New Key"
Keys are generated using the browser's
window.crypto.getRandomValues() API for strong cryptographic security. Your keys are generated client-side and are never sent to any server.About This Tool
This tool generates cryptographically strong 256-bit (32-byte) random keys, suitable for a variety of security applications such as JWT signing (e.g., HS256 algorithm), data encryption, or any scenario requiring a high-entropy secret.
Key Features:
- Secure Generation: Uses the browser's built-in cryptographic random number generator.
- 256-bit Strength: Provides a robust level of security for modern applications.
- Multiple Formats: Output keys in Base64 or Hexadecimal encoding.
- Client-Side Operation: Keys are generated entirely within your browser, ensuring privacy. Nothing is sent to a server.
- Easy to Use: Simple interface for quick key generation and copying.
Usage Note: For JWTs using HS256, the Base64 encoded key is often used directly as the secret. Ensure the system consuming the key expects the chosen format.